1 files changed, 156 insertions, 0 deletions
diff --git a/sca-java-1.x/tags/1.6.1-TUSCANY-3909/implementation-web-runtime/src/main/java/org/apache/tuscany/sca/implementation/web/ComponentContextServlet.java b/sca-java-1.x/tags/1.6.1-TUSCANY-3909/implementation-web-runtime/src/main/java/org/apache/tuscany/sca/implementation/web/ComponentContextServlet.java
new file mode 100644
index 0000000000..bf33f7ad9e
--- /dev/null
+++ b/sca-java-1.x/tags/1.6.1-TUSCANY-3909/implementation-web-runtime/src/main/java/org/apache/tuscany/sca/implementation/web/ComponentContextServlet.java
@@ -0,0 +1,156 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.implementation.web;
+
+import java.io.IOException;
+import java.io.PrintWriter;
+import java.io.UnsupportedEncodingException;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+import javax.servlet.ServletConfig;
+import javax.servlet.ServletContext;
+import javax.servlet.ServletException;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+import org.apache.tuscany.sca.assembly.ComponentReference;
+import org.apache.tuscany.sca.runtime.RuntimeComponent;
+
+/**
+ * Servlet that handles the GET request for the componentContext.js script
+ * 
+ * The script is generated by calling ScriptProcessors to output the code 
+ * for the SCA references, properties etc.
+ */
+public class ComponentContextServlet extends HttpServlet {
+    private static final long serialVersionUID = 1L;
+
+    protected static final String HEADER = "/** --- Apache Tuscany componentContext.js --- */\n";
+    protected static final String FOOTER = "/** --- Apache Tuscany componentContext.js EOF --- */\n";
+
+    public static final String COMPONENT_CONTEXT_SCRIPT_URI = "org.apache.tuscany.sca.componentContext.js";
+    
+    protected transient Map<String, Object> attributes = new HashMap<String, Object>();
+    protected transient ServletContext servletContext;
+    private transient List<ContextScriptProcessor> contextScriptProcessors = new ArrayList<ContextScriptProcessor>();
+
+    public ComponentContextServlet() {
+        contextScriptProcessors.add(new JSONRPCScripProcessor());
+    }
+
+    @Override
+    public void init(ServletConfig servletConfig) throws ServletException {
+        this.servletContext = servletConfig.getServletContext();
+        if (attributes.size() > 0) {
+            for (String name : attributes.keySet()) {
+                servletContext.setAttribute(name, attributes.get(name));
+            }
+        }
+    }
+
+    @Override
+    public void doGet(HttpServletRequest req, HttpServletResponse response) throws IOException  {
+        response.setContentType("text/plain;charset=utf-8");
+        PrintWriter out = response.getWriter();
+
+        out.write(HEADER);
+
+        doScriptInit(req, response);
+
+        doScriptReferences(req, response);
+
+        out.write(FOOTER);
+
+        out.flush();
+        out.close();
+    }
+
+    /**
+     * Calls each ContextScriptProcessor once to insert any required initilization code into componentContext.js  
+     */
+    protected void doScriptInit(HttpServletRequest req, HttpServletResponse response) throws IOException, UnsupportedEncodingException {
+
+        PrintWriter out = response.getWriter();
+        
+        out.println("if (SCA == undefined) var SCA = new Object();");
+        out.println("if (SCA.componentContext == undefined) {");
+        out.println("   SCA.componentContext = new Object();");
+        out.println("   SCA.componentContext.serviceNames = [];");
+        out.println("   SCA.componentContext.serviceProxys = [];");
+        out.println("   SCA.componentContext.getService = function(serviceName){");
+        out.println("      var i = SCA.componentContext.serviceNames.indexOf(serviceName);");
+        out.println("      return SCA.componentContext.serviceProxys[i];");
+        out.println("   };");
+        out.println("   if (componentContext == undefined) var componentContext = SCA.componentContext;");
+        out.println("}");
+
+        for (ContextScriptProcessor csp : contextScriptProcessors) {
+            csp.scriptInit(req, response);
+        }
+    }
+
+    /**
+     * Calls each ContextScriptProcessor for each SCA reference to insert code for the reference into componentContext.js  
+     */
+    protected void doScriptReferences(HttpServletRequest req, HttpServletResponse response) throws IOException, UnsupportedEncodingException {
+
+        PrintWriter out = response.getWriter();
+
+        out.write("// SCA References\n");
+        
+        RuntimeComponent component = (RuntimeComponent)servletContext.getAttribute("org.apache.tuscany.sca.implementation.web.RuntimeComponent");
+        
+        for (ComponentReference cr : component.getReferences()) {
+            String ref = "// SCA Reference " + cr.getName() + "\n";
+            out.write(ref);
+            for (ContextScriptProcessor csp : contextScriptProcessors) {
+                csp.scriptReference(cr, req, response);
+            }
+        }
+
+        out.write("\n// SCA References end.\n");
+    }
+
+    /**
+     * Calls each ContextScriptProcessor for each SCA property to insert code for the property into componentContext.js  
+     */
+    protected void doScriptProperties(HttpServletRequest req, HttpServletResponse response) throws IOException, UnsupportedEncodingException {
+        // TODO: support properties
+    }
+
+    /**
+     * Set an attribute on the ServletContext
+     */
+    public void setAttribute(String name, Object value) {
+        if (servletContext != null) {
+            servletContext.setAttribute(name, value);
+        } else {
+            attributes.put(name, value);
+        }
+    }
+
+    public void addContextScriptProcessor(ContextScriptProcessor csp) {
+        contextScriptProcessors.add(csp);
+    }
+}